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# Copyright (c) 2009 Denis Bilenko. See LICENSE for details.
"""
Low-level utilities.
"""
from __future__ import absolute_import
import functools
__all__ = ['wrap_errors']
class wrap_errors(object):
"""
Helper to make function return an exception, rather than raise it.
Because every exception that is unhandled by greenlet will be logged,
it is desirable to prevent non-error exceptions from leaving a greenlet.
This can done with a simple ``try/except`` construct::
def wrapped_func(*args, **kwargs):
try:
return func(*args, **kwargs)
except (TypeError, ValueError, AttributeError) as ex:
return ex
This class provides a shortcut to write that in one line::
wrapped_func = wrap_errors((TypeError, ValueError, AttributeError), func)
It also preserves ``__str__`` and ``__repr__`` of the original function.
"""
# QQQ could also support using wrap_errors as a decorator
def __init__(self, errors, func):
"""
Calling this makes a new function from *func*, such that it catches *errors* (an
:exc:`BaseException` subclass, or a tuple of :exc:`BaseException` subclasses) and
return it as a value.
"""
self.__errors = errors
self.__func = func
# Set __doc__, __wrapped__, etc, especially useful on Python 3.
functools.update_wrapper(self, func)
def __call__(self, *args, **kwargs):
func = self.__func
try:
return func(*args, **kwargs)
except self.__errors as ex:
return ex
def __str__(self):
return str(self.__func)
def __repr__(self):
return repr(self.__func)
def __getattr__(self, name):
return getattr(self.__func, name)
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